Retrievin pictures Whilst on hols, i accidently formatted the camera/sd card. How do i get the pictures back without deletin them????

replace your sdcard port its already loosing

Assuming you didn't download the pictures to your computer ... and as part of the download option, you elected to erase/remove the pictures (after downloading them) from the camera ... and you have not done anything (on the camera menu) to "refresh" or erase the pictures, or reformat the storage media (memory card) ...
then ...
... if the pictures are stored in a memory card .... you can take that memory card out of the camera, insert it into your computer ( ... or use a card reader, inserted into a USB port) ... and see if you can recover the "deleted" data from the memory card ...

... if the camera only has "internal" memory ... connect the camera to your computer ... and when it shows up as a storage media, try to recover the "deleted" data from the memory card ...

You can (find on the Internet) and install and use various (free) software (on your computer) to recover "deleted" files on storage media (memory card, etc.), ... on a Windows PC ... like PhotoRec, PC Inspector File Recovery, Undelete Plus (or Undelete 360), Glary Undelete, Wise Data Recovery, Recuva Free.

Have you by any chance moved the small slide to lock the card by accident.

which rules out that it is the SC card that isn\'t working Not necessarily, switching SD memory card from one camera to another without formatting isn't going to happen. If the SD card was new and not formatted in the camera that it's going to be used in then there could be a lot of different errors occurring. Also if pictures were downloaded from the memory card to the computer and the card not formatted this will cause a problem as well. If you have been deleting the pictures files then again this could be a problem the card needs to be formatted. Another IF is if you downloaded pictures from the computer to the SD card and then put it back in the camera without formatting then it's not going to acknowledge the card. If you formatted the SD card in the computer then it's not going to work or work properly in the camera. Picture files can go from the camera to the computer but not back again because the computer operating system and software is not compatible with the camera firmware. It all comes back to format the memory card in the camera you are using it in before taking pictures.

The Optio S4 works with MMC and SD cards. Your 4GB card is actually an SDHC card. While it fits into the slot, it is electronically incompatible. You need to go with cards 2GB and smaller.

Without knowing the make and model of camera I'm just going to guess you are using an SD type memory card and the card has been set to the "Lock" position most likely by accident. I have a diagram that can explain it faster then I can write it.

After downloading pictures to a computer Hard Drive the memory card should also be formatted for the camera it is being used in each time.

I think you just bug the application of your SD card...I suggest you reformat it again.....

The only thing I can recommend is using the brands of memory cards that Casio recommends. They are Panasonic, San Disc, Toshiba. Make sure the card is formatted with the camera before use.

wheather you check in computer repair shop is their any virus present in memory card? format your memory card! check virus is present in your computer or not! ?Try it!